"Using Rubber Bands as Power" PPT Courseware on Movement and Force

Description

"Using Rubber Bands as Power" PPT Courseware on Movement and Force

Preliminary exploration

Install the trolley

1. Connect the rubber band rings and fix one end to the frame and the other end to the axle.

2. Turn the wheel and let the rubber band wrap around the axle. Release your hand and the wheel will turn.

Use rubber bands as power

Can you find a way to control the direction of the car?

Think about it:

In order for the car to move forward, what direction should the rubber band wrap around the axle?

Give it a try:

When the direction of the rubber band is opposite to the direction of the car, the car will move forward.

In-depth research

Part 2: Study the relationship between the number of turns of the rubber band and the distance traveled by the car

Make assumptions about the relationship between the two.

Design experiments to test conjectures.

Our guess: (When the rubber band is wound for one turn, the elastic force produced is small; when it is wrapped for multiple turns, the elastic force is larger. When the rubber band is wrapped for one turn, the elastic force acts on the car for a short time; when it is wrapped for multiple turns, The elastic force acts on the car for a long time).

experiment plan

1. You can wind different numbers of turns on the axis of the trolley for comparison experiments. Discuss determining the number of laps for the experiment.

2. Also note during the experiment: the cars are the same and the rubber bands are the same. The ground is equally smooth.

3. Corresponding marks can be made on the ground to compare their driving distances.

4. The distance traveled by the car refers to the distance between the front wheel of the car from the starting point to the end point.

Use rubber bands as power

Within a certain range, if the rubber band is wound more times, its elasticity will be greater, and the car will travel farther; if the rubber band is less wound, its elasticity will be smaller, the car will travel closer.

How to make the car travel further?

Find a way to increase the length of the rubber band (make another fulcrum for tying the rubber band), find a way to increase the elasticity of the rubber band (install two rubber bands side by side), if the elasticity is too high and the wheels slip, you can increase the weight of the car appropriately...

Experimental requirements

①. Keep an eye on the end point, measure the distance with a measuring tape and fill in the record sheet in time.

② Think while experimenting: When the rubber band is wound one or more times, will the force generated be the same? Does the force of the rubber band act on the car for the same amount of time?

How to make the car travel further?

Note: The number of rubber band turns is not proportional to the distance traveled by the car. In other words, the distance traveled by the car when it goes around four times is not twice the distance it travels when it goes around two times, but farther because the elasticity of the last two times of the rubber band is greater. But some cars may be closer because the wheels slip due to greater elasticity.

How does the elasticity of a rubber band come about?

What are some things people do with elasticity?

Experiment 1: Pull the elastic band

Insert the index fingers of both hands into the elastic band, fix one index finger, and pull the elastic band hard with the other index finger. Feel the force on the fingers as the elastic band is stretched or shortened.

Experiment 2: Pull the spring

Hold the two ends of the spring with both hands, pull it slightly, then release it and observe what happens.

How does the elasticity of a rubber band come about?

Objects such as rubber bands and springs can easily change their shape when acted upon by external forces. When their shape changes, they will generate a force to restore their original shape. This force is called elastic force.

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Update Time: 2024-07-04

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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